<template>
  <div class="star" :class="starType">
    <span v-for="(itemClass,index) in itemClasses" @click='clickItem(index)'
    :class="[itemClass, disabled ? 'disabled': '']" class="star-item" :key="index"></span>
  </div>
</template>

<script>
  const LENGTH = 5
  const CLS_ON = 'on'
  const CLS_HALF = 'half'
  const CLS_OFF = 'off'

  export default {
    props: {
      size: {
        type: Number,
        default: 48
      },
      score: {
        type: Number
      },
      disabled: {
        type: Boolean,
        default: false
      }
    },
    computed: {
      starType() {
        return 'star-' + this.size
      },
      itemClasses() {
        const result = []
        const score = Math.floor(this.score * 2) / 2
        // const hasDecimal = score % 1 !== 0
        const integer = Math.floor(score)
        for (let i = 0; i < integer; i++) {
          result.push(CLS_ON)
        }
        /* if (hasDecimal) {
          result.push(CLS_HALF)
        }*/
        while (result.length < LENGTH) {
          result.push(CLS_OFF)
        }
        return result
      }
    },
    methods: {
      clickItem(index) {
        if(this.disabled) {
          return;
        }
        let next = index + 1;
        this.$emit('handleSelectScore', next);
      }
    }
  }
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .star{
    display:flex;
    align-items: center;
    justify-content: center;
    .star-item{
      background-repeat: no-repeat;
      cursor: pointer;
      &:hover{
        transform: scale(1.1);
      }
    }
    &.star-48{
      .star-item{
        width: 20px;
        height: 20px;
        margin-right: 12px;
        background-size: 20px 20px;
        &:last-child{
          margin-right: 0
          }
        &.on{
            background-image: url('star48_on@2x.png');
           }
        &.half{
            background-image: url('star48_half@2x.png');
          }
        &.off{
            background-image: url('star48_off@2x.png');
          }
        }
    }
    &.star-36{
      .star-item
      {
        width: 15px;
        height: 15px;
        margin-right: 6px;
        background-size: 15px 15px;
      }
      &:last-child{
        margin-right: 0
      }
      &.on{
        background-image: url('star36_on@2x.png');
       }
      &.half{
        background-image: url('star36_half@2x.png');
      }
      &.off{
        background-image: url('star36_off@2x.png');
      }
    }
    &.star-24{
      .star-item
      {
        width: 10px;
        height: 10px;
        margin-right: 3px;
        background-size: 10px 10px;
        &:last-child{
          margin-right: 0;
        }
        &.on{
          background-image: url('star24_on@2x.png');
         }
        &.half{
          background-image: url('star24_half@2x.png');
        }
        &.off{
          background-image: url('star24_off@2x.png');
        }
      }
    }
  }

</style>
